Pressure paint container



April 23, 1929. A, SHELBURN'E 1,710,435

PRESSURE PAINT. CONTAINER Filed May 10, 1923 nella@ ii-- 2 M E777 :it TL i i i /4 Mlm/RNE,

Patented Apr. 23, 19129,.

UNITED STATES AUGUSTINE SHELBURNE, OF SOUTH PASADENA., CALIFORNIA.

PRESSURE PAINT CONTAINER.

Application filed May 10,

Although my present invention may be referred to as a pressure paint container, it should be understood that this invention comprises broadly novel means and methods for the delivery of liquids to and through air brushes, or the like, such as are used in the application of paints, varnishes, enamels, or other liquid coating compositions, hereinafter generally referred to as paints.

It is an object of this invention to provide auxiliary means for the delivery of paints to an air brush, or the like in such manner as to employ compressed air not only for an aspirating effect upon the liquid referred to, by a reduction of pressure but also for the production of a positive pressure tending to facilitate the delivery of the liquid to the air brush, or its equivalent.

It is a further object of this invention to provide and employ for the purpose referred to means comprising an outer pressure receptacle, which may be structurally similar to a small autoclave or pressure cooker, for confining a body of paint orother liquid to be delivered through a pipe or tube, such as a tube leading to an air brush, and I prefer to employ, in this connection not only a pressure receptacle but also an inner container, such as a paint or varnish can or pail or'keg, adapted to coniine the coating liquid without necessarily permitting the same to contaminate or come in contact with the walls of the pressure receptacle. It is a further object of the present invention to provide means permitting a source of high-pressure compressed air to be so employed as to maintain a desired lower pressure Within a closed receptacle; and, in a preferred employment of my invention the same source of compressed air may be employed at the mentioned higherpressure to produce an aspirating or air brush effect; and my closed receptacle may optionally be provided also With a gauge or gauges Vand with a pop valve and a pressure release valve or other means for limiting the pressure therein, as well as suitable means for cutting of@ at will or, under predetermined conditions the flow of air thereto or therefrom, and optionally also with an additional valve to prevent a movement of the coating liquid through the air inlet pipe. Y

Other objects of my invention will appear from the following description of alternative embodiments thereof, and from. the appended 1923. Serial No. 637,359.

claims taken in connection with the accompanying drawings, in which- Figure 1 isa top plan vieW of one embodiment of my invention.

Fig. 2 `is a vertical section on the line 2-2 of Fig. 1.

Fig. 3 is a vertical section of an alternative and improved form.

Fig. 4 is a detailed view,'on an enlarged scale, which may be regarded as taken on the line 4 4 of Fig. 3.

Referring to the details of that embodiment of my invention shown in Figs. 1 and 2, 1 is an outer pressure receptacle shown as provided with a tight closure 2, extending over the entire top thereof, and provided with a gasket 3, secured in the ring 4 of said closure, and adapted to effect an airwtight joint when the said closure is secured in place by means such as the Wing nuts 5, threaded upon the pivoted blots 6, and cooperating with the slotted ears 7 upon said closure, in a well known manner.

Although I might put paint or another coating liquid directly into the mentioned receptacle 1, I prefer to employ therein anv independent inner container 8, Which may be an ordinary paint pail or varnish can in which the coating composition may have been purchased, this inner eontainer being suitable to retain the liquid coating composition out of Contact with the Walls of the pressure receptacle proper, although it need not be capable of withstanding high pressure.

Suitably connected with the closure 2, I find it advantageous to employ a plurality of fittings`,'tlie most important of which is the exit tube 9, yshown as extending approximately to the bottom of the inner receptacle 8 and as externally connected, by means of the coupling 10, elbow 11, and flexible tubing 12, with the paint inlet 13 of the air brush 14, the exit tube 9 thus serving to facilitate the delivery of the painter other coating composition coniined within the inner receptacle 8, when air or another pressure iuid is introduced above the surface thereof, as by means of the inlet 15.

Although any suitable means may be employed for the' introduction of air or other pressure Huid through the opening 15, I find it advantageous to use for this purpose a pressure reducing valve 16 of well known type, this pressure valve being shown as provided with a needle controlled by the handle i7, connected with lateral opening 18 in a T 19, comprised within the high pressure airsupply 20, leaving ley-means olf the tlexible. extension 21, to the air inlet 22, of the mentioned air brush 14, which may be oi any usual or preferred type.

lt will be understood that by a suitable adjustment of the pressure reducing valve 1,6, the flow o air into the interior of the receptacle 1 may be suitably regulated; but l prefer to associate therewith pressure limiting means such as the pop valve 23g-and l lind it convenient to employ also a gauge 24, in order that the pressure may be conveniently observed at any time and necessary readjustments made in accordance therewith. 1n order to release the pressure within the receptacle 1, aswhen a job has been finished or a new can oii paint is to be introduced, I find it convenient to employ-.also a pressure relcasevalve 25, it being understood that the auxiliary devices last referred to may optionally be connected with a lateral Wall et the receptacle 1, or otherwise disposed as may be convenient.

\ Inanother iorm o1' my invention shown in liig. 3,'it ,will be understood that 1 is an outerpressurereceptacle, which may be of the same general character as that disclosed in Figs. 1 and2, except that its cover 2ab is preferably fitted not only with an exit tube 9, extending intoipaint or the like, confined within theinner receptacle 8a, but is also provided with an airA inlet pipe 26, extending therein and substantially to the bottom thereor', in order that the .air which is to produce a moderate and substantially constant excess pressure abovc the sui-*tace of the mentioned liquid is also eiiective in the agitation thereof.

To support the air inlet pipe 2G l prefer to provide a housing 27, which may be integral with the cover 2, and may be provided with a threaded opening 2S adapted to receive the valve seat 29. eta return-preventing or pressure ,determining automatic valve 30, whose stem 31 is shown as surrounded by a compression spring 32, and coni'ined between an abut-ment 33 and vaiwasher 35i retained by a nut, this nut being adjustable to vary the compression ot the mentioncdspring. Instead of securing the inlet pipe 26 directly to the housing 27, l iiud it advantageous to employ a vreducing coupling 36, having a threaded engagement with both the pipe 26 and the valve seat 29, the construction being such that, when desired, the pipe 26 and all of the mentioned parts associated therewith may be removed together 'from the housing 27.

1n the construction now referred to, 15PL being 'l' Whose stem may form an integral lateral connection with the inlet fitting 37, provided with a needle hand valve 38, it will be understoodthatair admitted from a highpressure air supply through the lateral passage 39, and past the mentioned needle valve 38, may unseat the valve 30, and pass downward through the inlet pipe 26, bubbling up through the liquid contained in the receptacle 8a, and producing a desired pressure upon the surface thereof, this pressure being predetermined either by-the adjustment of the valve 3() orby the adjustment of a pop valve 23a, seated in an opening L10, which extends into the interior of the housing 27, it being understood that the needle valve 38 may be so adjusted that the introduction of air in the manner described corresponds approximately to the delivery ot paint from my container, in order to avoid an undue waste ot air tl'irough the pop valve 23'.

f1 pressure gauge 24a and a pressure release valve 251l may advantageously be provided, and it will be understood that the exit tube 9iL may be secured in anypreferred manner, as by the coupling nut al1, so thatjpaint will be forced through tube 12a, connected with an air brush or the like, with which a highpressure air supply is also connected inthe manner shown in Fig. l, or in any other desired manner, a substantially uniform moderate positive pressure being ordinarily advantageous.

Although a pressure'container such as 1 have described above Vmay be made Off any suitable material such as aluminum, and of any suitable size, and may obviously be associated with heating means, if desired, I'ind it advantageous to render my containerportable by means of a handle 42and1to adapt the same to receive receptaclesy of moderate size, such as gallon cans, it being understood, however, that even a. very-,smallpail or can maybe used in a;large1receptaele without loss or inconvenience.

As is well lmownfto workers in this art, an ordinary air brush, although adaptedto produce a sligl'itly negativepressure Within a tube with which it may be connected,iwill litt a coating or other viscous liquid through only a. relatively small vertical distance; but,fby the employment of my pressure container, compressed air maybe employed, at agauge pressure of say twoor three poundsto force a liquid from a lower'level, such as the level of a floor upon which the containermay rest, to a higher-level, as maybe neeessary'when an air brush is employed in painting or coating, for example, the ceiling ofga room,air at a higher pressure from the samemain with which my container is connected being then employed as desired, toassist in the delivery of the paint through and from, the air brush.

Although 1 have-described above two complete, advantageous embodiments ofmy invention, it willvbe understood that various parts thereof may be independentlyy used and also that various modificationsmay be made without a departure from the spirit and scope of my invention, as the-same is indicated above and in the following claims.

What I claim is:

l. pressure paint Container comprising in combination an outer pressure receptacle having a cover to make an air tight joint therewith, an air tight housing extending downwardly from the cover, an abutment in the housing, a ring having a valve seat connected to the housing, a valve engaging said seat, said valve having a stem wit-h a compression spring thereon, operatively engaging the stein and the said abutment, an air inlet to the housing, an inner independent paint container, an air pipe extending below the ring into the paint container and a paint pipe connected through the cover and leading toy the paint container. Y

2. A pressure paint container comprising in combination, an outer pressure receptacle having a cover to make an air tight joint therewith, an air tight housing extending downwardly from t-he cover, an air inlet having a valve in the cover opening into said housing, the housing having a valve seat, a valve slidably mounted therein having a stem, an abutment through which the stein operates, a spring on the stem operatively connected between the abutment and the stein, an air pipe extending downwardly from the housing, and a paint outlet pipe extending through the cover to the base of the container.

In testimony whereof I have signed my name to this specification.

A. SHELBURNE., 

